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R E I B R A B. R R

TELEPHONE SYSTEM.

Ptented Nov. 17

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(No Model.)

I R. P. BARBIER.

TELEPHONE SYSTEM.

' Patented NOJ. 17, 1885.

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' Uniritn Smarts a rears ROBERT PAUL BARRIER, OF PARIS, FRANCE.

- TELEPHONE aversive.

ESPECIPECAKION forming part of Letters Patent No. 330,368, dated November 17, 1885.

Application filed July 16, 1885. Serial No. 171,766. (No model.)

To alZwhom it may concern.-

Be it known that I, ROBERT PAUL BAR- BIER, a citizen of France, residing at Paris, in the Department of the Seine, France, have invented new and useful Improvements in Telephone Systems, of which the following is a specification.

This invention relates to a new system in which a telephone is'combincd with the ordinary electric call-system using pushbuttons. Heretofore a push-button call has been used in telephone station apparatus, the push-button operating to put the battery of the transmitter into circuit with the line. The new system is the converse of this, the telephone being combined with the ordinary push-button system. In this ordinary system, as is well known, there are at a central station a battery and signal-bell, which are included in circuit with a push-button at the distant station, the circuit being normally open at the push-button, but being closed to sound the bell when it is depressed. Usually a series of push-buttons, each in its own branch, is connected with a common battery, a single bell being used for all or a separate bell for each, or each branch being connected through an annunciator.

In the new combined system the telephone is placed in a branch derived from the pushbutton circuit, and means are provided for preventing the passage of the battery-current through its coils, except when in use, or at all times. Preferably a device such as a small secondary or primary battery is interposed in the telephone branch, which will prevent the passage of the low-tension battery-currents, but will allow the high-tension telephone-currents to pass. The same means can be utilized for calling, and other analogous purposes, a call-bell or other apparatus operated by hightension currents being placed in circuit with the secondary battery or its equivalent. Ordinarily the push-buttons are placed in small boxes, pear-shaped drops, paper-weights, and the like, and in the present (new) system the telephone is so constructed and combined with the push-button and its box that the latter need be but little, if any, larger than customary heretofore.

In the accompanying drawings, which make part of this specification, Figure l is a front elevation of a combinedpuslrbutton and telephone; Fig. 2, a side elevation of the same; Fig. 3, a front elevation with the box or cover of the instrument removed; Fig. 3, a perspective view of the telephoneanagnet; Fig. 4, a central vertical section of the instrument; Fig. 4, a sectional View illustrating a modification; Fig. 5, a diagram illustrating the ar rangement of circuits; Fig. 6, a similar diagram illustrating a special improvement; Fig. 7, a diagram showing a complete instrument; Fig. 8, a diagram showing one circuit; Figs. 9 and 9, vertical and horizontal sections, respectively, of a secondary battery which may be used in the system, and Figs. 10 and 11, diagrams illustrating a circuit with means for calling the sub-station.

The box B of the push-button, formed, as shown, from a single piece of wood or other material, contains the magnet NS (see Fig. 3) and the bobbin 2;, with its core attached to one pole of said magnet, as well as the spring Z and front contact, a, of the pushbutton. The button Z on the spring is exposed through a hole in the face of the box, as customary. The diaphragm m of the telephone is placed on the back of the box B, and is covered'except at the center by the mouth-piece E. A flexible cord, 0, composed of three insulated wires, is attached to the instrument. One wire is connected with the spring Z, (see Fig. 5,) and also with one terminal of the bobbin b, another with contactscrew 11, and the third with the other terminal of the bobbin 1). Thus the telephone is included in a branch derived from the pushbutton circuit. If desired, the spring Z may be provided with a back contact, 00, as shown in Fig. 4 for the purpose of enabling signals to be received at the sub-station provided with a push-button telephone, or for completing theline to another station or for other purpose. To secure the telephone-instrument to the wall when not in use a holder, R, is, or may be used. It is permanently secured to the wall, and is provided with a series of bent spring-arms, 1*, which retain the instrument in place, as shown in Figs. 1 and 2. In this holder is an automatic switch, L, for breaking the telephone branch. It consists of a spring-plate, a front contact, 0, and a pin, I, of insulating materialat the end of the plate.

When the telephoneis pressed into the holder, the mouth-piece E bears upon the pin I, and removes the plate from its contact 0, thereby opening the telephone branch. The line Z Z is connected with the'terminals of the signalbattery, and the opening of the telephone branch prevents battery-currents from passing constantly through the telephone. The currents may also be stopped by interposing in the telephone branch a secondary battery, K, Fig. 6, of sufficient electro-motive force to counterbalance that of the signal-battery.

Instead of a secondary battery, a primary battery, of the same electro-motive force" as the signal-battery, and with its poles opposed thereto, may be used. Any suitableform of battery may be employed.

The battery used, as represented in Figs. 9 and 9", consists of a small box or case of insulating material divided into comparttrodes k of lead wire. the terminal electrodes, a pair of electrodes is formed of a wire bent into U shape and hung over a partition.

The compartmentsor cells are filled to a suitable depth with dilute sulphuric acid.

Although the interposed battery effectually prevents the passage of the battery-currents, the telephone-currents being of higher tension have no difficulty in passing.

Referring to Fig. 7, a series of circuits,'l Z, are connected in derivation with the .poles of the signal-battery P. An annunciator and bell, S, are placed on one side of the battery, as common in push-buttonsignaling systems. A telephone, T, and its automatic or gravity switch are also provided, so thatthe telephone T can be included in circuit when desired.

When the circuit is closed at B at. any sub- 7 station, by pressing upon the push-button the current from the battery P traverses the circuit, rings the bell at the central station and drops the annunciator corresponding to the circuit which has been closed by the push-button. The telephone branch T at the sub-station is constantly closed; but the passage of the battery-currents is obstructed by the battery K. When the central station receives-a call over any line, it can by means of the telephones TT communicate with the person call- .ing, the battery K not obstructing the passage of the high-tension telephone-currents. In Fig. 8 the arrangement is substantially the same, except that there is only one circuit, and the annunciator is consequently dispensed with.

In Fig. 10, M is a magneto-generator in a A normally-open branch at the central station,

and M a key for connecting it in circuit. At

the substation the telephone branch is divided,

one part including a polarized 0r magneto bell, S, and the other the telephone T. -A gravity-switch, y, serves to complete the branch th ough the bell S or the telephone T, as it touches the contact t or w. Normally the position of the different parts is as shown. By closing the circuit at B the sub-station can call the central office. By operating the magneto-generator M and touching the key M the central office can call the sub-station, the hightension magneto currents passing readily through the batteryK. By means of the telephones T" and T the stations can communicate with each other.

In Fig.- 11 the central station is provided with an induction-coil and automatic circuitbreaker. The secondary wire is in a normallyopen branch connected with the key M. The primary wire and circuit-breaker are in a normally-open branch, which can be connected with the battery P by means of the switch W. To call the sub-station, the switch NV is turned to complete the battery-circuit through the induction-coil n and the key M is depressed.

. The currents induced in the secondary circuit ments by partitions, and provided with elec With the exception .of

traverse the battery K and telephone T, and produce a buzzing noise in the latter, which acts as-a call.

It is obvious that modifications may be made in the'details of construction and arrangement of parts without departing from the spirit of the invention, and that parts of the invention may beused without-the others.

By the term current-obstructor, as hereinafter employed,is meanta device whichdoes not allow-ordinary battery-currents to pass, whether it does (like the battery 'K) allow the passage of high-tension currents, or (like the switch L) obstructs their passage also.

'Having now fully described the said invention, what I claimis 11.1 The combination,with a push-button system comprising a battery and signal apparatus at a central station, circuits extending from the battery to one .or more sub-stations, and

push-buttons at said stations, of a telephone .substantially as described.

4. The combination, with the push-button circuit, of an apparatus such as a telephone or signal-bell operated by'high-tension currents and arranged in a branch derived from said circuit, and a secondary or. other galvanic battery arranged in said branch, substantially asidescribed.

15. A combinedpush-button and telephone, the telephone being arranged in the interior of the box of the push-button, in combination with parallel branches of an electrical circuit,

one including the telephone and the other connected with the front contact of the pushbut-ton, substantially as described.

6. A combined push-button and telephone, having the parts placed in a common box or support and attached toa flexible conductingcord and provided with conductors in or on said box or support, which conductors form parallel branches of the electrical circuit, one branch including the telephone and the other connected with the front contact of the pushbutton, substantially as described.

7. A combined push-button and telephone comprising a spring and contacts for opening and closing a circuit, and a telephone arranged in a common box, in combination with a battery, a signal apparatus operated thereby,and 

